// 表达式
const a = 1
console.log(a)
const b = 3
console.log(a + b)
function fn() {
  return 3
}
console.log(fn())
const arr = [1, 3]
console.log(arr)

console.log(arr.map((item) => item + 1))

// 语句
/* const test= if(a) {
}
console.log(test) */

/* const test = while(true) {}
console.log(test) */

/* for(let i = 0; i < 3; i ++) {} */
